US5259312A - Position-strict clamping of a printing plate on a printing cylinder - Google Patents

Position-strict clamping of a printing plate on a printing cylinder Download PDF

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Publication number
US5259312A
US5259312A US07/687,912 US68791291A US5259312A US 5259312 A US5259312 A US 5259312A US 68791291 A US68791291 A US 68791291A US 5259312 A US5259312 A US 5259312A
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US
United States
Prior art keywords
tensioning bar
stop
printing
cylinder
tensioning
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/687,912
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English (en)
Inventor
Claus Simeth
Karl-Heinz Sellmann
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MAN Miller Druckmaschinen GmbH
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MAN Miller Druckmaschinen GmbH
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Assigned to MAN MILLER DRUCKMASCHINEN GMBH reassignment MAN MILLER DRUCKMASCHINEN GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SELLMANN, KARL-HEINZ, SIMETH, CLAUS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B41F27/1231—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by translatory motion substantially tangential to support surface

Definitions

  • the invention relates to an apparatus for the accurately positioned tensioning of a printing plate on the printing cylinder of a printing mechanism, with the circumference of the printing cylinder being provided with a groove that extends in the axial direction of the cylinder so as to accommodate tensioning and fastening means for the printing plate.
  • the tensioning and fastening means include a front tensioning bar for the start of printing of the printing plate and a rear tensioning bar for the end of printing of the printing plate, with the rear tensioning bar being disposed ahead of the front tensioning bar in the direction of rotation of the printing cylinder.
  • Means are provided for the releasable fastening of the ends of the printing plate to the two tensioning bars and means for displacing the rear tensioning bar in the circumferential direction of the printing cylinder over a longer tensioning path for the purpose of tensioning the printing plate over the circumference of the cylinder and means for displacing the front tensioning bar in the circumferential direction of the printing cylinder over a smaller adjustment path for adjusting the image to be printed in the press.
  • the adjustment means for adjusting the printing plate cooperate with a stop fixed to the cylinder as the zero position.
  • Such devices are known in many embodiments.
  • This prior art has in common that the stop defining the zero position of the front tensioning bar is the front groove wall.
  • a plurality of tensioning screws are screwed into the front tensioning bar, spaced from one another and distributed over its length. These screws must be set manually so that the zero position of the printing cylinder comes into the desired position as required for the total press run.
  • this manner of setting the zero position poses problems. It is not possible to take the front groove wall as such as the zero position because then generally smaller bulges remain in the printing plate over the circumference of the printing cylinder, particularly at the beginning of the printing plate.
  • the invention avoids these drawbacks. It has as its object to propose an apparatus having the above-mentioned features with which the zero position of the printing plate at the printing cylinder, defining the image to be printed, can be realized reproducibly and accurately with few manipulations.
  • the invention is characterized in that the stop that is fixed to the cylinder and constitutes the zero position of the front tensioning bar is disposed at the side of the front tensioning bar oriented toward the rear tensioning bar and spring means are provided to urge the front tensioning bar against the stop.
  • the position of the front tensioning bar defining the start of printing is thus defined by this stop that is fixed to the cylinder and is oriented away from the front groove wall.
  • the zero position defined in this way is reliably attained with the aid of the spring means which urge the front tensioning bar against the stop fixed to the cylinder into the defined zero position.
  • front groove wall is that groove wall that is disposed adjacent to the front tensioning bar. Seen in the direction of rotation of the printing cylinder, this is the rear groove wall.
  • the stop fixed to the cylinder will be set correctly once and for all for a certain printing cylinder, with care having to be taken then that the once found setting cannot be easily shifted again. It is therefore preferred for the stop fixed to the cylinder to be adjustable and for it to be possible to lock it in the once set position.
  • a practical embodiment for this purpose is characterized in that a stop screw is screwed into a threaded bore in a strip fixed to the cylinder and disposed in the groove, with a locking screw lying against the circumference of this stop screw.
  • the tip of the stop screw thus constitutes the stop that is fixed to the cylinder and the once found location of the stop (of the tip of the stop screw) is locked in by the locking screw being appropriately screwed in. This once found and locked position may additionally be secured by suitable means.
  • stop and the spring prefferably be oriented coaxially with one another. Then no forces tending to twist the tensioning bar attack the front tensioning bar by way of the spring.
  • At least one adjustment screw is provided by means of which the distance between the front tensioning bar and the stop can be set.
  • two such adjustment screws are provided for the front tensioning bar of a cylinder, namely one at the front end and one at the rear end of the tensioning bar.
  • Actuation is further simplified if a device is provided by means of which all adjustment screws of the cylinder can be actuated jointly. If, for example, two adjustment screws are provided, they may be connected with one another by way of a rod so that they can only be adjusted jointly. Or, the adjustment screws can be changed by way of a common hand lever, or each adjustment screw is provided with such a hand lever.
  • the adjustment screws provided in the present invention do not serve the purpose of tensioning the printing plate. They are merely provided to space the front tensioning bar once it and the printing plate hanging from it have been hooked into the cylinder groove, from the stop fixed to the cylinder. Thereafter, the adjustment screws are released and the springs urge the tensioning strip to lie against the stop fixed to the cylinder, thus directly taking up the desired zero position.
  • FIG. 1 a schematic front view of a section of the printing cylinder according to the invention in order to explain the basic structure of the tensioning and adjustment means for the printing plate;
  • FIG. 2 in a view enlarged with respect to FIG. 1, the configuration according to the invention of the adjustment means for the front tensioning strip;
  • FIG. 3 also schematically, a top view of the arrangement according to FIG. 2.
  • FIG. 1 shows in a schematic front view a section of a printing cylinder 1 which rotates in the direction of arrow 2.
  • a cylinder groove 3 which accommodates a front tensioning strip 4 and a rear tensioning strip 5.
  • suitable pins 6 the ends of a printing plate indicated at position 7 are releasably connected with the tensioning strips 4, 5.
  • the pins engage in corresponding holes in the end regions of the printing plate.
  • Both tensioning strips 4, 5 are displaceable to a certain degree in the circumferential direction, that is, in the direction of double arrow 8.
  • the rear tensioning strip 5 can be displaced by a greater tensioning path of a few millimeters and the front tensioning strip 4 by a smaller adjustment path of a few tenths of a millimeter.
  • Both tensioning strips 4, 5 are displaceably held in the groove 3 on suitable guides which are not shown in the drawing.
  • FIG. 2 shows details of the configuration of the front tensioning strip 4 according to the invention with associated components with which printing plate 7 can take on the zero position in a defined manner.
  • a strip 9 is fastened at the bottom of cylinder groove 3 and is disposed on the side of tensioning strip 4 facing away from the front groove wall 10.
  • several spaced stop screws 11 are screwed into strip 9. See FIG. 3 in this connection in which the stop screws are shown only schematically. The tips 12 of screws 11 thus form a stop 12 that is fixed to the cylinder for the front tensioning strip 4.
  • springs 13 are urged by springs 13 against the tips of screws 11.
  • the latter need not be configured as coil springs as shown in the drawing, other spring means are also possible.
  • adjustment screws 14 are inserted into passage holes in tensioning strips 4, with the tips of the screws being screwed into threaded bores 15 in the cylinder.
  • adjustment screws 14 are actuated so that they release the tensioning strip 4, springs 13 push the tensioning strip in the direction of arrow 17 in FIG. 2 and are able to bring it into contact with screws 11. Without further action, the defined and once located zero position has now been taken up.
  • FIG. 3 also shows that two adjustment screws 14 are enough for each tensioning strip.
  • the adjustment screws may also be operated jointly.
  • the spring means 13 are accommodated in a suitable receptacle 19 in the tensioning bar or tensioning strip 4.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
US07/687,912 1989-10-09 1990-10-09 Position-strict clamping of a printing plate on a printing cylinder Expired - Fee Related US5259312A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3933678A DE3933678A1 (de) 1989-10-09 1989-10-09 Vorrichtung zum positionsgenauen spannen einer druckplatte auf einem druckzylinder
DE3933678 1989-10-09

Publications (1)

Publication Number Publication Date
US5259312A true US5259312A (en) 1993-11-09

Family

ID=6391111

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/687,912 Expired - Fee Related US5259312A (en) 1989-10-09 1990-10-09 Position-strict clamping of a printing plate on a printing cylinder

Country Status (7)

Country Link
US (1) US5259312A (de)
EP (1) EP0429808B1 (de)
JP (1) JPH04500050A (de)
AT (1) ATE97610T1 (de)
DE (2) DE3933678A1 (de)
ES (1) ES2048924T3 (de)
WO (1) WO1991004859A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5440989A (en) * 1993-02-27 1995-08-15 Heidelberger Druckmaschinen Ag Method and device for performing worksteps on a cylinder of a printing press
US5497703A (en) * 1993-02-27 1996-03-12 Heidelberger Druckmaschinen Ag Device for adjusting the oblique register in a clamping device for locking printing plates in an offset printing machine
GB2299784A (en) * 1995-04-12 1996-10-16 Heidelberger Druckmasch Ag Plate cylinder
US5884561A (en) * 1996-04-09 1999-03-23 Heidelberger Druckmaschinen Ag Method and device for releasing a sheet from a blanket cylinder of a printing machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4205276A1 (de) * 1992-02-21 1993-08-26 Roland Man Druckmasch Vorrichtung zum aufspannen einer druckplatte auf einen plattenzylinder
DE4210897C1 (de) * 1992-04-02 1993-08-12 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
DE4240462C2 (de) * 1992-12-02 1994-09-22 Roland Man Druckmasch Vorrichtung zum registergenauen Aufspannen von Druckplatten auf dem Plattenzylinder von Druckmaschinen

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1198377B (de) * 1961-10-21 1965-08-12 Maschf Augsburg Nuernberg Ag Einrichtung an einer Vorrichtung zum Befestigen biegsamer Druckplatten am Formzylinder von Rotationsdruckmaschinen
US3583318A (en) * 1967-04-12 1971-06-08 H W Crabtree & Sons Ltd Printing plate clamping means
US3625151A (en) * 1969-07-07 1971-12-07 Baker Perkins Ltd Printing plate locking device
DE1786317B1 (de) * 1968-01-15 1971-12-30 Register System Gmbh Vorrichtung zum befestigen und justieren von biegsa men druck platten an plattenzylindern von druckmaschinen
US3750571A (en) * 1971-02-06 1973-08-07 Koenig & Bauer Schnellpressfab Plate clamping device for intaglio printing presses
FR2195528A1 (de) * 1972-08-07 1974-03-08 Register System Gmbh
US3884147A (en) * 1972-05-26 1975-05-20 Roland Offsetmaschf Device for fastening flexible printing plates
US3913480A (en) * 1972-05-23 1975-10-21 Koenig & Bauer Ag Device for locking up flexible printing plates on forme cylinders of printing presses
US3946670A (en) * 1972-07-17 1976-03-30 Ball Corporation Apparatus for mounting and locking printing plates
DE2500282A1 (de) * 1975-01-04 1976-07-29 Karlheinz Ahlsdorf Vorrichtung zum einspannen von an ihren einspannraendern passlochungen aufweisenden druckplatten in offset-maschinen
US3994224A (en) * 1975-06-09 1976-11-30 Newspaper Equipment Company Mounting structure for printing plates
US4006686A (en) * 1975-09-18 1977-02-08 Ackerman Stephen P Blanket fastening means for a cylinder blanket
US4596188A (en) * 1983-07-26 1986-06-24 De La Rue Giori S.A. Method of fixing and adjusting a printing plate on a plate cylinder and device for carrying out the method
US4646639A (en) * 1984-11-28 1987-03-03 Man-Roland Druckmaschinen Aktiengesellschaft Apparatus for stretching a printing plate on a plate holding cylinder
US4724762A (en) * 1985-03-22 1988-02-16 Heidelberger Druckmaschinen Ag Device for clamping and aligning flexible printing plates on a plate cylinder of a rotary printing machine
EP0304646A2 (de) * 1987-08-25 1989-03-01 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Aufspannen von biegsamen Druckplatten auf dem Plattenzylinder von Rotationsdruckmaschinen
DE3843395A1 (de) * 1987-12-30 1989-07-20 Polygraph Leipzig Lagegenaues schnellaufspannen flexibler druckplatten
US5014619A (en) * 1988-03-01 1991-05-14 Heidelberger Druckmaschinen Ag Device for tensioning flexible printing plates on a plate cylinder of a rotary printing machine
US5076167A (en) * 1989-11-02 1991-12-31 Man Roland Druckmaschinen Ag Arrangement for the parallel tensioning of printing plates

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2556237C2 (de) * 1975-12-13 1986-05-28 Stahlecker, Fritz, 7347 Bad Überkingen Spinnmaschinenanlage mit mehreren Offenend-Spinnmaschinen und wenigstens einem Wartungsgerät

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1198377B (de) * 1961-10-21 1965-08-12 Maschf Augsburg Nuernberg Ag Einrichtung an einer Vorrichtung zum Befestigen biegsamer Druckplatten am Formzylinder von Rotationsdruckmaschinen
US3583318A (en) * 1967-04-12 1971-06-08 H W Crabtree & Sons Ltd Printing plate clamping means
DE1786317B1 (de) * 1968-01-15 1971-12-30 Register System Gmbh Vorrichtung zum befestigen und justieren von biegsa men druck platten an plattenzylindern von druckmaschinen
US3625151A (en) * 1969-07-07 1971-12-07 Baker Perkins Ltd Printing plate locking device
US3750571A (en) * 1971-02-06 1973-08-07 Koenig & Bauer Schnellpressfab Plate clamping device for intaglio printing presses
US3913480A (en) * 1972-05-23 1975-10-21 Koenig & Bauer Ag Device for locking up flexible printing plates on forme cylinders of printing presses
US3884147A (en) * 1972-05-26 1975-05-20 Roland Offsetmaschf Device for fastening flexible printing plates
US3946670A (en) * 1972-07-17 1976-03-30 Ball Corporation Apparatus for mounting and locking printing plates
FR2195528A1 (de) * 1972-08-07 1974-03-08 Register System Gmbh
DE2500282A1 (de) * 1975-01-04 1976-07-29 Karlheinz Ahlsdorf Vorrichtung zum einspannen von an ihren einspannraendern passlochungen aufweisenden druckplatten in offset-maschinen
US3994224A (en) * 1975-06-09 1976-11-30 Newspaper Equipment Company Mounting structure for printing plates
US4006686A (en) * 1975-09-18 1977-02-08 Ackerman Stephen P Blanket fastening means for a cylinder blanket
US4596188A (en) * 1983-07-26 1986-06-24 De La Rue Giori S.A. Method of fixing and adjusting a printing plate on a plate cylinder and device for carrying out the method
US4646639A (en) * 1984-11-28 1987-03-03 Man-Roland Druckmaschinen Aktiengesellschaft Apparatus for stretching a printing plate on a plate holding cylinder
US4724762A (en) * 1985-03-22 1988-02-16 Heidelberger Druckmaschinen Ag Device for clamping and aligning flexible printing plates on a plate cylinder of a rotary printing machine
EP0304646A2 (de) * 1987-08-25 1989-03-01 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Aufspannen von biegsamen Druckplatten auf dem Plattenzylinder von Rotationsdruckmaschinen
DE3843395A1 (de) * 1987-12-30 1989-07-20 Polygraph Leipzig Lagegenaues schnellaufspannen flexibler druckplatten
US5014619A (en) * 1988-03-01 1991-05-14 Heidelberger Druckmaschinen Ag Device for tensioning flexible printing plates on a plate cylinder of a rotary printing machine
US5076167A (en) * 1989-11-02 1991-12-31 Man Roland Druckmaschinen Ag Arrangement for the parallel tensioning of printing plates

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5440989A (en) * 1993-02-27 1995-08-15 Heidelberger Druckmaschinen Ag Method and device for performing worksteps on a cylinder of a printing press
US5497703A (en) * 1993-02-27 1996-03-12 Heidelberger Druckmaschinen Ag Device for adjusting the oblique register in a clamping device for locking printing plates in an offset printing machine
GB2299784A (en) * 1995-04-12 1996-10-16 Heidelberger Druckmasch Ag Plate cylinder
GB2299784B (en) * 1995-04-12 1998-06-10 Heidelberger Druckmasch Ag Plate cylinder
US5884561A (en) * 1996-04-09 1999-03-23 Heidelberger Druckmaschinen Ag Method and device for releasing a sheet from a blanket cylinder of a printing machine

Also Published As

Publication number Publication date
DE3933678A1 (de) 1991-04-18
ATE97610T1 (de) 1993-12-15
EP0429808B1 (de) 1993-11-24
JPH04500050A (ja) 1992-01-09
WO1991004859A1 (de) 1991-04-18
DE3933678C2 (de) 1991-08-14
DE59003614D1 (de) 1994-01-05
EP0429808A1 (de) 1991-06-05
ES2048924T3 (es) 1994-04-01

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